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I have one confusion when in question we knw tht speed is getting reduced so should we put the sign of acceleration negative?? For ex in this question:- A car moving in a straight line at 30 m/s slows uniformly to a speed of 10 m/s in 5 sec. Determine: (a)the acceleration of the car, (b)displacement in the third second. When I take the sign of “a” negative the magnitude of a is coming out be positive and when I put the value of “a”(+ve) in b part i get wrong answer of b part

I have one confusion when in question we knw tht speed is getting reduced so should we put the sign of acceleration negative?? For ex in this question:-    
 

A car moving in a straight line at 30 m/s slows uniformly to  a speed of 10 m/s in 5 sec. Determine:

(a)the acceleration of the car,

(b)displacement in the third second.                                                                                             When I take the sign of “a” negative the magnitude of a is coming out be positive and when I put the value of “a”(+ve) in b part i get wrong answer of b part

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